drm/i915: Stop using a 'reg' variable

'reg' is a very non-descriptive name. Just get rid of the silly
local variable and spell out the full register name always.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20231101114212.9345-3-ville.syrjala@linux.intel.comReviewed-by: Jani Nikula <jani.nikula@intel.com>

drivers/gpu/drm/i915/display/intel_display.c

@@ -398,7 +398,6 @@ void intel_enable_transcoder(const struct intel_crtc_state *new_crtc_state)
 	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
 	enum transcoder cpu_transcoder = new_crtc_state->cpu_transcoder;
 	enum pipe pipe = crtc->pipe;
-	i915_reg_t reg;
 	u32 val;
 
 	drm_dbg_kms(&dev_priv->drm, "enabling pipe %c\n", pipe_name(pipe));
@@ -431,16 +430,16 @@ void intel_enable_transcoder(const struct intel_crtc_state *new_crtc_state)
 		intel_de_rmw(dev_priv, PIPE_ARB_CTL(pipe),
 			     0, PIPE_ARB_USE_PROG_SLOTS);
 
-	reg = TRANSCONF(cpu_transcoder);
-	val = intel_de_read(dev_priv, reg);
+	val = intel_de_read(dev_priv, TRANSCONF(cpu_transcoder));
 	if (val & TRANSCONF_ENABLE) {
 		/* we keep both pipes enabled on 830 */
 		drm_WARN_ON(&dev_priv->drm, !IS_I830(dev_priv));
 		return;
 	}
 
-	intel_de_write(dev_priv, reg, val | TRANSCONF_ENABLE);
-	intel_de_posting_read(dev_priv, reg);
+	intel_de_write(dev_priv, TRANSCONF(cpu_transcoder),
+		       val | TRANSCONF_ENABLE);
+	intel_de_posting_read(dev_priv, TRANSCONF(cpu_transcoder));
 
 	/*
 	 * Until the pipe starts PIPEDSL reads will return a stale value,
@@ -459,7 +458,6 @@ void intel_disable_transcoder(const struct intel_crtc_state *old_crtc_state)
 	struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
 	enum transcoder cpu_transcoder = old_crtc_state->cpu_transcoder;
 	enum pipe pipe = crtc->pipe;
-	i915_reg_t reg;
 	u32 val;
 
 	drm_dbg_kms(&dev_priv->drm, "disabling pipe %c\n", pipe_name(pipe));
@@ -470,8 +468,7 @@ void intel_disable_transcoder(const struct intel_crtc_state *old_crtc_state)
 	 */
 	assert_planes_disabled(crtc);
 
-	reg = TRANSCONF(cpu_transcoder);
-	val = intel_de_read(dev_priv, reg);
+	val = intel_de_read(dev_priv, TRANSCONF(cpu_transcoder));
 	if ((val & TRANSCONF_ENABLE) == 0)
 		return;
 
@@ -486,7 +483,7 @@ void intel_disable_transcoder(const struct intel_crtc_state *old_crtc_state)
 	if (!IS_I830(dev_priv))
 		val &= ~TRANSCONF_ENABLE;
 
-	intel_de_write(dev_priv, reg, val);
+	intel_de_write(dev_priv, TRANSCONF(cpu_transcoder), val);
 
 	if (DISPLAY_VER(dev_priv) >= 12)
 		intel_de_rmw(dev_priv, hsw_chicken_trans_reg(dev_priv, cpu_transcoder),